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Unedited Footage Of The Bombing Of Nagasaki

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Unedited Footage Of The Bombing Of Nagasaki

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[Unedited Footage Of The Bombing Of Nagasaki]

[Bombing Of Nagasaki]Source: LYBIO.net
This video is annotated. If you don’t want the text bubbles, click the gear icon, turn annotations to “off.” Note that it is a silent film – nothing is wrong with your speakers!

This footage takes place on the island on Tinian, the home of the XXI Bomber Command, about 1,600 miles from Japan. Here they are moving the fully-assembled Fat Man bomb out of its hangar.

It was a big bomb. It weighed over 10,000 lbs, though the plutonium core at its center, which powered the nuclear explosion, was only 13 lbs.

The yellow paint is a rust-preventing zinc-chromate primer. It had been used for trial runs of the bomb drops – using just high explosives, known as “Pumpkins” – because it made a bomb trajectory easy to see.

Note the logo on his shirt – “FM” = “Fat Man.”

They are sealing the bomb up to protect the internal components against water. The round “columns” jutting out of the front of the casing are a contact fuses that would cause the bomb to disable itself in case it failed to detonate at the correct altitude.

Arming fuses.

Tinian is a tropical island in the Pacific Ocean, next to Saipan. It was very hot and humid. Hence no shirts.

They first tested the waterproofing sealant they are using here on a surfboard. True story.

They haven’t inserted the “Archie” radar fuses yet. They will go here.

The unusual-looking “vanes” in the tail were to help stabilize the usually heavy bomb, both so it could be reliably aimed at a target, but also to keep it from rotating violently and damaging the fragile internal electrical components.

The final tail design was chosen out of many trial shapes, and was known as the “California parachute.”

The bomb itself consisted of the nuclear charge and its electrical wiring. The nuclear charge involved using specially-machined high-explosives to spherically compress a plutonium core, making it supercritical. By this point the internal components have already been fully-assembled.

[Bombing Of Nagasaki]Source: LYBIO.net
They are covering the bomb with a tarp, because outside of the people approved to be in the assembly area, even its shape was still considered a secret. It was remain secret until 1960.

The scientists at Los Alamos had calculated that there was about 20% chance of failure for this design bomb. They were also worried about the possibility of it detonating on the airfield, if the plane lifting it out crashed on takeoff (which was fairly common). The bomb had no safety features.

Even aside from its nuclear dangers, the bomb contained a huge amount of regular high exlosives (eg. TNT) which were used to compress the plutonium core. So it had to be handled carefully.

They are moving into a recessed loading bay, so that it can be put into the B-29 bomber named “Bockscar.”

I don’t know why the film switches to black and white for awhile. Perhaps a different camera? Or just washed out?

These B-29s were specially outfitted to deliver atomic bombs, as part of Project Silverplate. They had slightly different configurations than standard B-29s – they were slightly higher performance, and had different bomb bays. Most of their anti-fighter weaponry had been stripped away so they could carry more weight.

The B-29 Superfortress, “Bockscar,” piloted by Charles Sweeney. Its primary target on August 9th was the city of Kokura, Japan, but heavy clouds obscured visibility, so it moved instead on to Nagsaki.

You can see that the nose plate of the bomb has been signed by the soldiers.

“Fat Man” was a very snug fit within the B-29. It was an unusually large bomb even without its atomic qualities. Practice runs had been made with Fat Man casings full of just high explosives, known as “Pumpkins” because of their fat shape and orange color.

[Bombing Of Nagasaki]Source: LYBIO.net
This is Bockscar, seen from another observing bomber. The triangle-N on its fin is camouflage, marking it as being part of (normal) 444th Bombardment Group, rather than the (atomic) 509th Composite Group. This was so that any Japanese who saw these bombings would not be able to identify which bombers carried atomic bombs.

It is about to cut to the bombing of Nagasaki…

Shock front in the clouds, caused by the bomb.

The mushroom cloud rises very fast to its maximum height. The cloud of a 20 kiloton bomb, like that of Nagasaki, can reach heights of around 25,000 feet.

The cloud head is taller than the height flying aircraft at this point, only a few minutes after the detonation. Note that the cloud top and the “stem” have not mixed. This is because the bomb detonated some 1,650 feet above the target, in order to maximize the destructive blast wave. The “stem” is debris from the ground, pulled upwards by the fireball, but they were far enough away from each other that they did not intersect.

The ground is completely obscured by smoke. Some 70,000 people are dead. US observers would first enter the city in October 1945.

This appears to be a slow-motion version of the previous footage. The sort of thing that would interest scientists.

Unedited Footage Of The Bombing Of Nagasaki. It is about to cut to the bombing of Nagasaki… Shock front in the clouds, caused by the bomb. Nuclear Weapons In Wartime Transcript, Dialogue, Remarks, Saying, Quotes, Words And Text.